Electric discharge device



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Uec. 3, 1929. H. W. mcmmw ELECTRIC DISCHARGE DEVICE Original Filed Dec. 22. v192'? "in l' lliim" a Tim-9m lnventqr: Henry W. Jackson,

lliil II b H as Attorn Patented Dec. 3, 1929 HENRY W. JACKSON,

PATENT. OFFICE.

or scnnnn'cranr, new YORK, ASSIGNOR TO GENERAL nnnornio COMPANY, A CORPORATION OF NEW "YORK ELECTRIC DISCHARGE DEVICE Application filed December 22, 1927, Serial No.'241,932. Renewed August 19, 1929.

The present invention relates to the construction of electric discharge devices, and

more particularly to an improved grid and anode structure to be employed in such devices whereby a large emission area maybe secured.

In the copending application of Langmuir et al., Serial No. 7 40,998, filed October 1, 1924, there is disclosed an interleaved grid and anode structure with a cooperating centrally disposed filamentary cathode. With such an arrangement the emission areais relatively small since the cathode is limited to a single filamentary wire. According to the present invention I obtain the advantages of the interleaved grid and anode structure such asdisclosed in the above application, and at the same time form the grid and anode in such a manner that a multi-filament cathode may be employed" to thereby obtain alarge filament emission area.

The novel features which I believe to be characteristic of the invention are set forth with particularity in the appended claims. The invention itself, however,

specification when considered in connection with the accompanying drawing in which Fig. 1 is a perspective vlew of an electric discharge device embodying the features of the present invention; Fig. 2 is a plan view on an enlarged. scale of the electrode structure; While Fig. 3 is a detail view on an enlarged scale of one section of the anode and one section of the grid structure.

Referring t0 the drawing, I have indicated at 1 an evacuated receptacle having an inwardly extending stem 2, an anode 3, grid 4, andfilamentary cathode-5. The anode com prises two similar and oppositely disposed metal sections 6 and 7 which, when'joined together, provide an electrode member substantially rectangular in cross section. Two opposite sides of the anode have corrugations 8 thereon, while. the other two sides of the anode are provided with extensions 9 and 10 adapted to embracesupporting wires 11 and 12', respectively, as indicated clearly in Fig. 2.

The grid or control electrode 4 likewise comprises two similar'me'mbers or sections 13 having portions 16 and 17 in alignment will best be understood from reference to the following out of the'metal sheet and extend at right i angles thereto. When the grid is assembled 5 the opposite sections thereof provide'a I I hollow, substantially rectangular membelii wit the extensions 9 and lO-of the anode. The grid portions 16 and 17 embrace supporting Wires 18 and 19 respectively. The grid is so disposed within the anode that the slats 15 projects into the corrugations 8 on the anode providing an interleaved structure for the two electrodes.

As thus arranged a plurality of rectilinear extending cathode members 5 may be mount ed within the grid elect-rode. On the drawing, I have indicated two such filamentary wires connected at one end by a wire 20 supported from stem 2 by wires 21 and 22.

A metal shielding plate 23 is secured at the lower end of the grid by lugs 24.

.W hen it is desired to introduce caesium into the container 1, a disc 25 containin a caesium compound and an element adapte to-reduce the compound may be mounted on the anode supporting wire as indicated in Fig. 1.

What I claim as new and desireto secure by Letters Patent of the United States is:

1. An electric discharge device comprising an anode, grid and filamentary cathode, the anode and grid being substantially rectangular in cross section, portions of the grid being arranged in interleaved relation with the anode.

2. In combination, a hollow anode comprising two similar and oppositely disposed corrugated sections, a second hollow electrode mounted within the anode and comprisin two sections each similar to the other an provided with projecting portions extending into the corrugations on the anode, and a filamentary electrode mounted within the second electr'o e. 1

3. An electric dischar e device comprising a cathode and a pair 0% electrodes substantially rectangular in cross section and arranged one within the other, opposite sides of the outer electrode being corrugated, the inner electrode having projecting portions extendin into the corrugations on the outer electro e, said cathode comprising a plurality of rectilinear extending wires mounted within the second electrode.

In witness whereof I have hereunto set my hand this 21st day of December 1927 HENRY W. JACKSON. 

